SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">
<script src="http://examplet.buss.hk/js/jquery.caret.min.js"></script>
<input id="myTextInput" type="text" value="some text2">
<input type="button" value="set mouse" id="btn" />

JavaScript

$(document).ready(function () {
    $('#btn').on('click', function () {
        var inp = $('#myTextInput')[0];        
        var pos = 7;
        inp.focus();
        if (inp.setSelectionRange) {
            inp.setSelectionRange(pos, pos);
        } else if (inp.createTextRange) {
            var range = inp.createTextRange();
            range.collapse(true);
            if (pos < 0) {
                pos = $(this).val().length + pos;
            }
            range.moveEnd('character', pos);
            range.moveStart('character', pos);
            range.select();
        }
    });
});